OBLICZ: (podrecznik MATEMATYKA 2001 kl.5 str 150 sprawdz sam siebie ćw4)
12(całości) 7/12 - (7<całości>1/6 + 2<całości> 3/5) =
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12 7/12 -( 7 1/6 + 2 3/5)=
=12 7/12 -(9 5/30 + 18/30)=
=12 7/12 -9 23/30 =
=151/12 - 293/30 =
=755/60 -586/60=
=169/60 =2 49/60